Minnesota school shooter Robin Westman feared that vaping use had caused terminal cancer before they decided to open fire at a Catholic School, killing two children.
The 23-year-old transgender gunman posted a suicide note to a now-deleted YouTube page just hours before shooting through stained glass windows at children sitting on the pews inside Annunciation Catholic School's church on Wednesday morning.
Two children aged eight and 10 were killed in the attack and at least 17 other victims - 14 children and three adults - were injured before Westman died by suicide, authorities have said.
The shooter explained in a suicide note how they were struggling for years with depression and suicidal thoughts - which apparently grew worse with the belief they had terminal cancer.
'It's a tragic end as it's entirely self-inflicted,' Westman wrote, explaining: 'I did this to myself as I cannot control myself and have been destroying my body through vaping and other means.'
